Citric acid is an organic compound derived from lemon juice, and can be used for so many things: cleaning, cooking, cosmetics, pharmaceuticals or as a pH regulator.
 
Food grade citric acid is a weak natural acid with potential descaling properties and a rust removing action. Such a wonderful, useful household product particularly due to its limescale removing properties.
Ideas for use
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Descaling Dilute 1 or 2 tablespoons of citric acid in 1L of cold water and use this solution to descale coffee machines, kettles, cups, taps, showerheads and more Rinse with clear water afterwards. 
- 
Remove limescale Remove limescale from your washing machine, put 6 to 8 tablespoons of acid in the drum and run on a cycle (90°C)
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Toilet bowl cleaner Pour half the bag into your toilet and leave overnight. 
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General household cleaning Replace vinegar as a cleaner throughout your home.